in thickness, the surface with minute
warts and ridges. Spores subglobose, yellow, 10-12 mic. in diameter.

Growing on the inside of old bark. Plasmodiocarp about .4 mm. in
thickness and various in length; in my specimens the sporangia are
mostly small rings. The species looks exactly like _Ophiotheca
Wrightii_, but the character of the threads is quite different.

4. OPHIOTHECA PALLIDA, B. & C. Plasmodiocarp terete, oblong or elongated
annular and flexuous, the surface dull, pale ochraceous; the wall a thin
pellucid membrane, minutely granulate, with a thin pale ochraceous outer
layer, irregularly dehiscent. Capillitium of slender loosely-branched
threads, 2-3 mic. in thickness, the surface minutely warted or
spinulose. Spores subglobose, pale yellow, 10-12 mic. in diameter.

Growing on dead stems of herbaceous plants. Plasmodiocarp .3-.4 mm. in
thickness, variable in length, sometimes short and roundish or oblong,
sometimes much elongated and flexuous. More delicate than _Ophiotheca
vermicularis_, and distinguished by its pallid color throughout.

ORDER IV. ARCYRIACEAE.

Sporangia regular and stipitate, rarely sessile; the wall a thin
membrane, minutely granulose, colored as the spores and capillitium, the
upper part soon torn away in a somewhat circumscissile manner, and early
disappearing. Capillitium of slender tubules, repeatedly branching and
anastomosing to form a complicated network of evident meshes, more or
less expanded after dehiscence; the surface of the threads minutely
warted or spinulose or with elevated ridges in the shape of rings, half
rings or reticulations.

This order is specially distinguished by the threads of the capillitium
forming a complicated network of evident meshes.

TABLE OF GENERA OF ARCYRIACEAE.

1. LACHNOBOLUS. Capillitium of slender tubules, quite variable in
thickness, proceeding from numerous points of the sporangial wall.

2. ARCYRIA. Capillitium of slender tubules, issuing from the interior of
the stipe, the network without any free extremities.

3. HETEROTRICHIA. Capillitium issuing from the interior of the stipe,
the peripheral portion of the network bearing numerous short acute free
branches.

I. LACHNOBOLUS, Fr. Sporangia stipitate or sessile, the wall a thin
delicate membrane, minutely granulose, rupturing irregularly. Stipe
short or sometimes wanting. Capillitium of slender tubules quite
variable in thickness, proceeding from numerous points of the sp